The main purpose of FGVC is to locate highly discriminatory regions. Many methods such as NTS-Net[1]}, FDL[2]}, StackedLSTM[3]} find strong discriminative preselected boxes through Region Proposal Network (RPN), then resize the preselected boxes to a fixed size, and use these local strong features to identify, that is to say, these methods will actually divide the identification task into two stages.
